United States · Illinois · Aledo
Mercer County Jail
Data is aggregated from public sources and may be incomplete or out of date. Always verify with primary sources before acting on any figure. See data sources.
For families
How to send mail, money, and visit Mercer County Jail
Step-by-step guidance using the United States system — addresses, money services, visit booking, what to bring on your first visit.
Mercer County Jail is a county jail located in Mercer County, Illinois. Rated capacity: 102. Reported population: 64. Security level: Maximum. Data sourced from the HIFLD Prison Boundaries open dataset.
Background
The Mercer County Jail is a historic county jail building located at 309 South College Avenue in Aledo, Mercer County, Illinois. Completed in 1909, the building was the county's third jail and its second in Aledo. Architect Clair F. Drury of Moline designed the Tudor Revival building. The two-story brick building features terra cotta ornamentation, including quoin-like window surrounds. The building's cross gabled roof has a large gable above the main entrance; both its gables and its dormers are parapeted.
Source: Wikipedia article lead, CC-BY-SA.
Capacity
102
Current population
64
Occupancy
63%
Year opened
—
Operational
Figures from official sources · verified 2 Jun 2026 · methodology
Facility profile
Population held
Mixed/unknown
Opened
—
Region
Illinois
Security level
Maximum
Death-row facility
No
Conditions
No conditions summary available yet.
Visiting
No visiting information available.
Mailing
No mailing information available.
Practical info
Contact the operator's website for inmate-specific procedures.
Known issues
No major issues documented in our database.
Contact & address
Conditions Risk Score
Derived signal — not a judgement. How it's calculated
- Overcrowding
- 0/30
- Oversight reports
- 0/30
- Structural flags
- 0/15
- Death signals
- 0/15
- Conditions text
- 0/10
This facility scores 0. The national average across 7,437 scored United States facilities is 2 — 2 points below national average.
Related facilities
Same country, matched on type + security level where possible.
- Beaufort County Detention CenterWashingtonMaximumCounty jail222% occupancy
- Abbeville County Detention CenterAbbevilleMaximumCounty jail200% occupancy
- Southwest Virginia Regional Jail - TazewellTazewellMaximumCounty jail330% occupancy
- Franklin County Detention FacilitySt. AlbansMaximumCounty jail660% occupancy
- Spartanburg County Main JailSpartanburgMaximumCounty jail152% occupancy
- Anderson County Detention CenterAndersonMaximumCounty jail183% occupancy
Compared to other facilities in United States
7436 peersData completeness
74%How many of our profile fields are populated. We surface this so families and researchers know the limits.
Sources
- HIFLD Prison Boundaries
- HIFLD dataset query
- Wikipedia — Wikimedia Foundation
- HIFLD Prison Boundaries — US Department of Homeland Security â HIFLD Open Data
- Wikidata — Wikimedia Foundation
- Wikidata (Q23302815)
- Wikipedia
- See /data-sources for our overall methodology.
Cite this page
Under CC-BY-4.0. Include the URL and access date; the site is a living reference and entries can change.
World Prisons. (2026). Mercer County Jail. Retrieved October 23, 2026, from https://worldprisons.com/prisons/mercer-county-jail
"Mercer County Jail." World Prisons. Accessed October 23, 2026. https://worldprisons.com/prisons/mercer-county-jail.
@misc{worldprisons-mercer-county-jail,
author = {{World Prisons}},
title = {Mercer County Jail},
year = {2026},
url = {https://worldprisons.com/prisons/mercer-county-jail},
urldate = {2026-10-23}
}